Didn't one of these style rides stall at the top of the loop once? In France i think it was. I remember seeing it on the news and everyone hanging from the lap bar haha.
Yes there was a video somewhere, I can't find it, but there were people stuck upside down hanging on for dear life. I believe someone could be seen falling or partially falling.
That can't be quite right, considering Thunder Looper traversed it's loop backwards the forces weren't trying to pin you into your seat, but the opposite!